Quote:
Originally Posted by milandro
reviving this question
Rice water should work, in itself, not because it has starch (which certainly has) but because it contains Arsenic.
but i see other people in this thread have commented on the low amount of arsenic in rice.
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There's trace amounts of arsenic in all kinds of foods, though rice has a higher amount (within the confines of safe).
Maybe the combination of sulfur and some arsenic is what does it, with sulfur acting like a kind of multiplier which allows for even small concentrations of arsenic to be effective. But this is a wild guess.
If I have some time I'd be interested to try adding some sulfur in with some ineffective realgar I bought off the internet and see if it yields a better result compared to just realgar alone, using the brush stain method.